Comment 4 for bug 1352038

Yes it appears that overlayfs no longer sees submounts, so a workaround is needed.
Unfortunately bind-mounting the submounts over the work dir makes it possible for the cleanup phase to *write* to them, as they would be "above" the COW, not below it.

This affects aufs as well.

Maybe a compromise could be to bind-mount them read-only on top of workdir...