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ef8becfac5f1d8e0cfce69afd3aadffb330efb70
We often open the parent directory of a path. Let's add a common helper for that, that shortens our code a bit and adds some extra safety checks, for example it will fail if used on the root directory (which doesn't really have a parent). The helper is actually generalized from a function in btrfs-util.[ch] which already existed for this purpose.
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