Strange btrfs subvolumes

This seems to be a known issue with docker, see [btrfs] Docker and Subvolumes

I don't use docker so I'm not 100% clear on what's going on, but that thread contains a lot of very good info and a number of external links, as well as an apparent fix and future stopgap for the issue. It seems they are safe to delete, but the thread may detail the best-practice way to do so, as well as a method for preventing docker from littering your drive with soon-to-be-orphaned subvolumes.

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