selftests/filesystems: check that an automount below an overlay layer is refused

Make sure that we don't automount on top of internal things.

Link: https://patch.msgid.link/20261002-work-mount-fixes-4-v1-12-dd44b89d44ce@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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Christian Brauner 2026-10-02 15:52:43 +02:00
commit 39796254f4
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