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The AuFS manual says:

Policies for Creating create=tdp | top−down−parent

Selects the highest writable branch where the parent dir exists. If
the parent dir does not exist on a writable branch, then the internal
copyup will happen. The policy for this copyup is always ’bottom-up.’
This is the default policy.

What happens if there are multiple writable branches in which the parent directory exists?

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