Right, that is a valid question, although I'm no expert on OverlayFS so can't
really answer that.
The only "explanation" (as to why EXDEV is issued on a `rename(2)` call) that
I've found is the following excerpt from a comment in the OverlayFS
[code](https://github.com/torvalds/linux/blob/v4.8-rc2/fs/overlayfs/copy_up.c#L318-L322):
> [...] This means, when copying up a directory we can rely on it and ancestors
> being stable.
There's also some more documentation on `redirect_dir`
[here](https://docs.kernel.org/filesystems/overlayfs.html#renaming-directories)
with some hints on the "why" (although no clear explanation either).
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