[issue37339] os.path.ismount returns true on nested btrfs subvolumes

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

os.path.ismount() uses the same simple algorithm as a portable version of mountpoint. But mountpoint (and findmnt) from util-linux uses Linux specific methods (reads /proc/mounts or something like). See also issue29707.

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<https://bugs.python.org/issue37339>
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