[Unionfs] Kernel oops with 2.6.16

[Mike Hearn]

On Sat, 2006-03-04 at 16:36 +0900, hooanon05 at yahoo.co.jp wrote:
> First, your branches are 'overlapped' and unionfs doesn't allow such
> branches. mount command is expected to exit with "Invalid argument" or
> something.

Hrm, not a very useful error. What does overlapped mean in this context?
If I tried to unify /snapshots/root and /snapshots/snap1
onto /snapshots/workspace would this work? What if I did a bind mount
of / to /snapshots/root?

thanks -mike