[Unionfs] What branch is a file from?

[Robin Lee Powell]

(Fixing up the subject line; very sorry.)

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.

-Robin

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