selftests: add tests for mount notification

Provide coverage for all mnt_notify_add() instances.

Signed-off-by: Miklos Szeredi <[email protected]>
Link: https://lore.kernel.org/r/20250307204046.3

selftests: add tests for mount notification

Provide coverage for all mnt_notify_add() instances.

Signed-off-by: Miklos Szeredi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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