Also affects Ubuntu 20.04 LTS (and other distributions like Debian 10).
Indirectly reported upstream on
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=17676 "btrfs subvolumes
and bind-mounts make df report incorrect and/or extra results" (the
reported bug is a consequence of the issue on btrfs
Note that there is no issue on Debian because there are these
dependencies: tcplay → libdevmapper1.02.1 → dmsetup. On Ubuntu dmsetup
is only a recommendation of libdevmapper1.02.1.
Also this bug can be reproduced with Ubuntu 18.04 LTS as well.
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