I use docker quite a lot for my work and other projects.
I was very happy when docker got the support for cgroups.
Now I started learning more about btrfs and noticed something.
╭─eha at eha-desktop in ⌁
╰─λ sudo btrfs subvolume list /
ID 256 gen 77576 top level 5 path @
ID 257 gen 77576 top level 5 path @home
ID 258 gen 77549 top level 5 path @root
ID 259 gen 77508 top level 5 path @srv
ID 260 gen 77574 top level 5 path @cache
ID 261 gen 77576 top level 5 path @log
ID 262 gen 77574 top level 5 path @tmp
ID 372 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b8172a6a23ff814b732780361aaa47f341e6c15943d5a0decb778fceec961134
ID 373 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/21539b56522dbf67ba30b03e28319868aa4a40eed9c880d483a955d1d263e4c3
ID 374 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b62214dfe9352307138900207f29f3fff8d829e10d1e9892dbb3a000ebaaf1c6
ID 375 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/92b3e4e08cf2e1627cb3d9ce816270b23b5fdf88ed55d21b8c8865abeeca5078
ID 376 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cf2181eadc29cd03dfe8d8c31d4f56600155ded1160b50868f3c50420220b20b
ID 377 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e03330bf1c0719a7aa16e82e3da3b45190abdb9b2ecbbde6d2581b22a01b3b67
ID 378 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/5a1f65319a165519c8354c4d968469366fd7aeab2e9f1baf41b131306d36ad74
ID 379 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/652fe6d76ca4d7a492e9b36ea97f6ac1c5ad7d991b3ad398f756e37c2645b433
ID 380 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c22e5b61698a32845f6325d996922947d906886d8bf12ad8b37e49957f4a9f85
ID 381 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b68b9a84c08c27cbdf403b6b5c98855ac09b523cf3c14e107991131ed4fb3116
ID 382 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1bc3714d23e8815c02e0df6e03cf39b82e6917f4573f71dd28c0c408fe7552c9
ID 383 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cad456c85d7a721bc91ae553a47c57cebd822e4f1246105755a2d6f1ed4c6b43
ID 384 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e5510d4006c41988f5748d51b0350f0b866ee2c9b1085ef3f1159f9880b1414f
ID 399 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/27fc7d15623d59d6e04121caa30e51b7f1c5fb5226fa268fbb688e4419575eaf
ID 405 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f2d091b6506a8d61fc3dcce324ca87fc3d3027b9e86ea26a2a9f284ddc792c5e
ID 408 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e51a1d0068adb3cc57b3ed823c4ba961affb60d11b1f0bac142f793a1ddf372c
ID 411 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/2fe50d7acd3a576fd00f38e2bb72934f22eb40f1267fcff5d3c41cbe4c604dd4
ID 414 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/625ba318bb1a4a605230e0cb6216873f4e43bf7cefc8a627259a424752ac45d0
ID 416 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c0dc64b576960cabf94b3d017dd197bc337eb0ff67a61cfca70635f9498f91d4
ID 419 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c53d17555899b8868f0250093b2ad380db3010f1379f3927f4512f46e87c1dda
ID 421 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/3fc2195387463a2a5c4e39dedd8ae72bd7d706ca6462ee5ab466a4fe84157e9d
ID 501 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/a97bccc1b48b8b7057e1076798bed746d311f073e8194dd3f5e53a814c2a5bb4
ID 507 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/ff885029234b631ce9beca14a16759963ce896380596731e2e700393f16aade8
ID 510 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/5d875abe41f851b011c2241ab5b2ba04cd6a371eed67e1115da1c0f2c8365972
ID 512 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/6eeed55c5b498f18c5579de251100f1dde1e0000bbbe6d68f33ba9ca97e50293
ID 514 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/d3f48e1d28912de41a512b09e094d2004569111ac3724cf94528c87e43149917
ID 516 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/ed8663f7b30f7597289a7b7a043acdce4d7a79abf574f1fcaa4c795b0c7a0132
ID 519 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/58b7d0228e56f8c7501b06de4364bb89117341268f917d136851e30f280025eb
ID 578 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/52323b22ee8c0c909bea7bb392f049756d3a86645598eea86ba6ae3fb81abe98
ID 580 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/9d45932d89816a39af103a7bce06eb3137fe3fdfdd87cf379953dd0df19a7bdc
ID 582 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1d4e57bb2ad4490953e8ac4d64d168f27e9ac99ae22319e6617c1f599313b451
ID 584 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/3cd098760e4dfdb13f1a359081591bc545c1bca29214777cb4f11dbde2219ac2
ID 587 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/985861c213b9e0defad0043f19c9b23a95446855a74dca6c4012885b189df3eb
ID 592 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/7adc20ea5c066c31e43a2df25120c33189ed70be13edd5951fc799aa29bb1295
ID 594 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/816efe3db4affbeaca6dab39680b04a8782a99b56dc7701bc89fce11109625e0
ID 597 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c77ab952936516811982e3487a34cf5287d10725bdc7e57258cd9875cf356768
ID 599 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c24dc8068b2358c35fe942d8f1189c401c525f6fa64d9292aae549c81d322ae2
ID 601 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/62d73f9574f9411ecc3479a4017e59d377dea2cb13e53625033bd4613c757fb0
ID 604 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/7bdb3c1368f49fb4ed53f79142c831a6f5529a8fd4248f94a12418c3761f9761
ID 609 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f72413767c05b3ff12d18216ef98d626f7e87b9ca29f7994fa85afc0f5f994f5
ID 611 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/bede1b1c57c4f8ac01262a83f82dc923be4f6a18daea6bb32e2439c6bd37f7ac
ID 614 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1f91b189b382247cb1ecd05a917e6934d44e888b0c5518e862d247861f9c116d
ID 616 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/4f0cc47b555660fd2f511915c6a61fab779b907957d0dddd41e2a99a38d1f55a
ID 617 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/95920bd7593e96ebfede7ff64dde747b6d8ea8061321a37b5218a027aad38fe9
ID 618 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c5ca1d82c50dac33e65d4318539b21aa1d49c4cd055c19a62d16035c08f07887
ID 619 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/fe09303af58e12fe14d1878f0f766bb54a1fbdbf79e6a69e3bfb228d218a5bc3
ID 620 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/ea05bf24ca78c34696546b672118e7780440ae1f5b666fb580c65dbd2039732b
ID 621 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cd212ba040cc7d4c60ecf8216cffce17cf0300918a3bea7de9cce22a02216976
ID 622 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/8115af94301f81462f14d8580c0a82c77b2fccbe64181e9a8c0dcbb6e2ff4c69
ID 623 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/11823f81bb7d348940340ac8ac5680f35571732056b4cd84acc18704342910c9
ID 624 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/a1cede4a10673ffb32ac63778257580dfb6efc74d97e8ec4fa6d60b1a3e2b2e2
ID 625 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/dea9fa4d3b42ca9d67890746b06e4c004c9fa540de827e9227268ab31b9c5abe
ID 626 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/608f25215103e88188c8d3fffb6a5fe283867b24821d2d2b3bbe2db0435e9730
ID 627 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/be3cfbc16a96407442d4342c58c5fe2a8ffe4ffdea688837c75f273cd8582929
ID 628 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/8f43d755bfe6485250fdb9dba308b11ef912168802119d3cbc34ab5f7d553ae5
ID 629 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/4b37cae7ab0cc8a75c6570da1d2813602418b359c2e0806a3107e364a48d90c7
ID 636 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/da164612e6df7ad0a8e433925e6b66987f7b4cbae814ec2196abf3858ed23401-init
ID 638 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/12984d3c75fe310f7b6647cc01fdcefd5b5ad55c439863449114ff41163a07e6-init
ID 642 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/6e9aebca3d94b171608c375390c00f0d2d3b3bdb92b842c52d4015506e4628e4
ID 677 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/d710da053cd0afb5ba036b6e338c3bbe6f314b20c35fb2cbef09b2627a4e0936
ID 702 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/75f4f0d441df218e827228fb8240b308d2d7cc9bfc4e76aab411acde7dc9aaca
ID 704 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/089d311937ce0b4ae79b453bc3ad33e17b735c683a24e2416b3f7588981acf90
ID 707 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/bdcc37f365757f4e745cfa71a7bd96bda7737042cfc708e82518605150378efb
ID 714 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/0f030f1f82e9af85b60bee6abd9fd7a91dfc7217eb07fb20f0e23b698170a549
ID 716 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/69bc13319282714fdfe4d8d89412eb821d2706a2ea03ca0ff6fcaf7eb65a597e
ID 723 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f389d7b65e23350dd78db04db7a1d97c6545ba7e97551d5d21e3cd1a7bd574a5
ID 728 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/71931762d5ae9e5d4acfdbcd41dce368020080e1fc50c4464991de04c1599499
ID 731 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e965d25857a2686531d7aed564bd9ba56c7e359ebc3848451f87eb4ada2a4667
ID 734 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/047bd2383854892ac6b3d68e551e01982cb55711fa65314457183967b8ee64e4
ID 736 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/3a59d913e23cd54a5f7800c1adb56511a785b336e4ff52c2c3d5725a253feee4
ID 739 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/32222c311b098c107914499f93356df5f26de9be9e11763c12ab0b4278c8b8a9
ID 744 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/9553f199986b0882d54cc259267932c6077bbf3285380d183620af354948c663
ID 746 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/ea0321a50d6292d94e41fa8dc1baaa8413079bd2afd68345e59aadc66f68e3e1
ID 749 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1fa2d7df6916332ba6ba588a9c64de80c7b08e3c43a91d59b2373409f5167b95
ID 754 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/2b13d1609eac07f0dfd70ae2ce7c3418bee4655c2114310b0ae97b494a12df0c
ID 768 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/85611102c273e8d32a340ac16a5e35817a34a23a2525b46c53f40ab26eea7a23-init
ID 772 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/0489c9d16f0f65b76523c692bfb7b3ae5df075600ad04ed217669f19dc58cf2f-init
ID 774 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/769fcf4ba0d0bb56b5766d485d916d4d513f54310d13bdc058b68d4c2067999c-init
ID 780 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/a32668d9aceb6901b8b25337a9e35374ba3becd0016c2c13e51b906bff9b7632-init
ID 784 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/67368fe6dace2ba69df91d220393b6a902194a2b7864f9056ea21e4e07911660
ID 785 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/91403a76c494f07ef1fdd3a1dbaf7df2d4e69937ac3e0081d30868189000ef60-init
ID 791 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e4b1aff4c3857a376fd84d6a233d95168bc197787ee543e21686aedc1f8eb897
ID 792 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/8c24fecebd91fcd8b618247bc1736c23be160142ce4ebb5712a9a7352afebf98-init
ID 796 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1308e3d7bdb5b1f677f3f6eda67ad8a704f8762c4493b9f7f6f9bd79e2789143-init
ID 800 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/dc38bbcd9d8175e01124d2a6e1f96ab40a1ebcb807c9d69db076a893a1d8dbab
ID 803 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f65c1c776fef47d882ea652f54cb55a80f30279c1b163cf84ebe3b6fe30c23e3
ID 805 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/674de21aa0958e7607ff883cd23b08b62bdfc8b6d133d2ccd4462d8b3519e801
ID 809 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/90b2476a75bb1f078b54970128690f39b5dad53eac09b6c123c937dbc14d7a1b-init
ID 813 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/08759d405c1cd1cf93fab22929566e833960ff0f8563b2fc29f1b9a5c72fb82d-init
ID 815 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/5511185d4d14151c43f24df854080ddc73f3a7f825f1a23a98325eb0c9189043-init
ID 818 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/240436f58142f44e6db21021cd81d7a1e103c9c3858ce159b3917dfda30d05ee
ID 822 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/57a734220bceb9b31e8d08c0113cb6c21372c29efbe6d344fa80b075886e5035-init
ID 825 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/625b11b50cad02d48ca051ed303c0e58d7426582d6da17996e78035199c68a08
ID 829 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/045122535b3c1f0dd4b19c1b8b624fb51d2ec72ed9905e8190f01ec93c3ed819-init
ID 835 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/020eeda372efc5b3f10eb2e623717cefc51fde9a7d835c394e0ecce2bd139501
ID 837 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b51a9ec4f1a220573150d862bf036978cf96dcf524e12d932cf3fe4594c895d1
ID 841 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/8a5bdcf95032e2dd4cbcf055c6f133c14bee260ce1d82a4c26528d22cea233ef-init
ID 844 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/8559328d21f71604bfd84ffa268ae55078f0979b1103bca8fb1753091180eed0-init
ID 848 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/d7fa80cac5a35ba7ca2b2895bc4ff8991c8e4273c9d5769d1a548ef02ae59fd8
ID 850 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b56ed9d40d0672155188544f8e1a71603d237292f528cefc07129f232b4e60cc
ID 854 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/4ed4a95d5b4cb1ebf1f95d77517c300f0248db4b15e2903c3d135571c2592c9a-init
ID 858 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/de614ac127ed99b9978a363450e7ab4e1d859e9d7ec48fd3b5e0d7cd5b678aed
ID 860 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/bcdb74f7e1b3be08688438230051d872ad5fd345cca27d6cb824fba852882d5f
ID 864 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/00390c2f032d04686dc8f2aedff575e17f5d49516dfd71823be674ee21222c94-init
ID 866 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/9e2bf37c1d9e64e9d6aa4e7e68f65e7f5743950fd5b18c6273ef5816f92dd3a1-init
ID 869 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1ee9e5a075eb02e781c83c11b9c0aef7a9404ea60b5cb3157c9950fb855533bb
ID 873 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f39d0904574f194d26e02558de454192d562a9f05f2a84136a218cfc31511cf7-init
ID 876 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/87066d5a51409444c270d6c909af7a362338c578039bc98092f2abacfda54676
ID 880 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b5b70b8d11e47acd101c9820e86d51d1b7992f584095bd4db5f6d59108616844-init
ID 884 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1d300600ce60fd33025903162a577f42252774b1857350ec0a11b81ea68e44ec
ID 886 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f419a6d2a0777ac0e085ac93654b5b8941ca33fad26bec53d88ea915a7b27f7b
ID 890 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/295f9c2062289c3bc519bd705ce34b6f9986f6f8d25d6acc675aff6c36aab5af-init
ID 893 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/6709e8218779e7aa266254134e2abb404cd5f18689f0730edede3eee84711bb2
ID 897 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/6f87fa635affc8664830a8174b6c323a54c3e3ba2844ff17e81bb06a7247a794-init
ID 899 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/bc20e1c993c08358bb37a21ebe16d31494ffc9c280048e5af4cb58d8faa2d56b-init
ID 901 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/98ba0808807dca0a28d9adbb4db3462529914775ae61392195215c7d8c90d334-init
ID 903 gen 77543 top level 256 path var/lib/docker/btrfs/subvolumes/ffb9ee30d2c6e668ee45d58d44a38dbd712fc14d07cc6049efbf015ee2a2053d-init
ID 905 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/7b0febffff980fb41e29a281b88c4640afc6f94bd57ff7149b6c2368aa777af2-init
ID 913 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/deceb9f3e5d756ef19f12dbd1dd8188c6d21bf682225009fa2f379ee0b22e23d
ID 915 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e1a86dff117de6e86f07ead320d714e374459841eca23a6f2c6ef9ec6f9d00cc
ID 919 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/0d7a5c67a90e8f52f13cfb2251bbd9ba5e1eee93573d39f0af9ecb3a3a31ff44-init
ID 921 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/61d7aec07008a36d219d6524576c8cc907e01c8f011566734faa5b15a8f84632-init
ID 924 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/59fd14a19b8ed76a1dec2199b3c589bbd5d74935f29a991c347e6eb22657acc3
ID 928 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/62e177f8411651981ce630bd7d40006b238a1f55ad2d6f1c08221ca5243f2106-init
ID 930 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/a606217506d50ec8596dc0d31e7865247a33bad8909dd223d4a43c9a884688a4-init
ID 934 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/b563534eed3a6407db58e4fe9636c6c57733ffbb901cd0f5e02ba52cd6f816bb
ID 936 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/115ed740ca5083349c1e061d7a3de38f5266036962c879e241b7c2fa1087dced
ID 940 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/11acaa402118b0bfcfd0ca4009fa04cbe7af21d1de45defc5c9c9f012d0d579c-init
ID 944 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/5f88f9c71cf32a9c83452e947a8c7cbb0532edc84bfbbb136e74c2f333201977
ID 946 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/2b31fcbdb965d00a5d00f9ceba259e442c09e06ce3bbcee878d2fbcfe39b6975
ID 1027 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e0ae6a95703c61cbe40c38987fd1cc1b6e1a86a669a8612f8a85424772f83f9d
ID 1070 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/3079410ed22f4db2bc72d0849a53a2795d28c0884633df799678060bc91198b2
ID 1077 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/39dfc7404a07c6aef4e4e5a3bceb2a3f2cec28e959c56ad91523b5926af58f5a
ID 1102 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f4974a53aef5935d499d9f34615cb1edccdce58d278d3fc79569e27d1a404ea7
ID 1104 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/57ea8acae3a062d8da520fd26cc64f9ac07bd2f9ecdb09ba0836488bce082828
ID 1106 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/a933bca655fa5fd5d5a27ad6c8ea9c47f227b9b1befd0d514daccdc9e905e824
ID 1108 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cd475af38c23c2fdd572e42b6b2331ee0349c1e8a1775387b4e134589f0deb4b
ID 1111 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/0ceba61c0db0d3dd55cee839ed578bc216eb499dc946c083dec6ea7ee274e8af
ID 1114 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/64f1b81840ed107f52a22e12bf34a8905e7fb2a97a51d38780b5cc864ec1a1a8
ID 1170 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/5f27c16a515072571b41d63269cd330d0a3da4d9b95a6f81fd8119c7cfe06f51
ID 1172 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/9998cafe236f69ac6ff7eb05aaf2a8de76077ce239d8ccc35167a44a4f40731e
ID 1263 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/9139de4cfe9807b8605ea49f263fdacfd610281a480dd7830e524dee64da1652
ID 1265 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/35dd76b4e6b802a6e884ef852f21259664ebf6ae4910df2a3970ecfebe355251
ID 1268 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/eaa4763c291fd8945ed9d282dcbad7c798cc6bd72ab26f7036e768806a8450db
ID 1271 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/1145d39f3c96d19821cf398b55d8df5469627bde81623b2a9cc0492c146722aa
ID 1278 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/0d5cc15adfbbf4352a96c53dbdf70d52b188bcc9bdbd4b3c9f228277b5e6777c
ID 1280 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/c0dd2291176f6b6c54e46cdb497bee88d1a500922ea28d733aa52ecf35afb89d
ID 1282 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/a8e1bda0ccf7b4dc2c90b0cf38ec46c692760dba00248b975f89314b0bb7c5cb
ID 1285 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/4151b0ea202bf0d4fbaa26f2c4096acdb2c6c9772a1e93d0afd0e79343dcf5d1
ID 1288 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f8c0129fd600bcb53ca5ddc32a7eafe63660925d006d7e9de101869be8dbab0a
ID 1297 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/47a6f48655bc3bd452b50ed0151a066edcf3644b7acc7d21d011d40fdbb3bf58
ID 1299 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cb6c62d362c0dc24434a12fb0fd028e58dc2a14156c534d41ef63586b9318e1c
ID 1301 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/75079e4afac231cb2f35fadfffc1b2fb5af193bca283a46caed7c31b0dd7c704
ID 1304 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/5bf54beff970eeb2181f7e9ebf9c91b8cc443d08beb021493b1f0ec6a917dc67
ID 1307 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/4de003b5c96f4f40d4981af2dcf8de799777361af4f88eda9ce14dd11288ca2e
ID 1311 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/da61cc7719632034db83d37ec8fc2500e6fabfcfb75edbf43fec4f55d78be1f0-init
ID 1471 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cca5331a5e625965b4deecff14e43660ce3ad6de936a7d24efde7d3a23210aa1
ID 1473 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/d8eb9a13d3cc675ed4315cc05f0e1df7e4af230617a38d29294a3812cc009680
ID 1490 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/ccda6a980587cb53ef53be0fa2c0b331b5cc99d54fb9d1a145168816c8da47b8
ID 1493 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/14b980e8bc224e5c0716e456e4933648bc2d7fd90976b3c70a9156d9488481e3
ID 1496 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/4b9d4f06f52aefd4f43c46233805947d33bdb81244c2fc4271e9b0acf18723ac
ID 1511 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f9abd00f867dc272b94d73b949d668385dc40c0cc7bc0c9b492d6486667a8308
ID 1513 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/cd08312d1306a7428eef0ed83718d716dfaa220c4280ad977e67bcbd82305e04
ID 1516 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/e316aa9e6ff6f4bd5cf5c35f27c04fbd0614603bc8db3b8d311f529e63fdd259
ID 1521 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/2484e9a164cb8ea71b60b4ae44ceee47e1f0ae356a94f4ad93579d88e11c09fa
ID 1524 gen 77537 top level 256 path var/lib/docker/btrfs/subvolumes/f29c1d4201f431bd4d3fa9e56265ffac3525b18b4f547cf0c0871a1796fa68ca
ID 1529 gen 77543 top level 5 path timeshift-btrfs/snapshots/2021-02-19_16-06-14/@
ID 1530 gen 77543 top level 5 path timeshift-btrfs/snapshots/2021-02-19_16-20-17/@
ID 1531 gen 77543 top level 5 path timeshift-btrfs/snapshots/2021-02-19_16-39-01/@
ID 1532 gen 77543 top level 5 path timeshift-btrfs/snapshots/2021-02-20_01-21-06/@
ID 1533 gen 77543 top level 5 path timeshift-btrfs/snapshots/2021-02-20_01-22-59/@
ID 1686 gen 77558 top level 256 path data/eha_data
uhm...
Lets check some facts about my local docker
╭─eha at eha-desktop in ⌁
╰─λ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
╭─eha at eha-desktop in ⌁
╰─λ docker volume list
DRIVER VOLUME NAME
I try to keep my docker pretty clean, just the images I build and no stale stuff.
But from the above output of sudo btrfs subvolume list /
it looks like the btrfs subvolumes of the docker volumes got never deleted?
I did not create any btrfs subvolume for docker.
I did not make any fancy docker config.
I am running Docker version 20.10.3, build 48d30b5b32
as plain as it is from pacman.
I also started searching about this and found this:
and
This look promising.
Is this a known thing? Could this also cause performance issues?