[Unionfs] What file is a branch from?

[Robin Lee Powell]

I have a slightly odd use case in mind, one in which it would be
very useful to be able to tell which branch a particular file is
"from" (that is, the highest priority branch the file first appears
in).

Is this at all possible?  I didn't see anything like this is in the
various tutorials and such online.

Thanks.

-Robin

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