I try to understand how to build a tree of snapshots (i.e. - which
subvolume was used to snapshot/clone other subvolume). What is the
correct way to determine it? In particular, "btrfs sub list -p" always
prints something for "parent snapshot", while btrfs sub list -q" only
prints parent_uuid for actual snapshots (i.e. for subvolumes I know are
snapshots). Are "parent" and "parent_uuid" related to each other? Of
not, what do they mean?
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