> FYI, I hope to be able to commit something to the tree RSN which
> will support this, and doesn't require union mounts, so that Solaris,
> Darwin and Linux users won't lose out. (Darwin seems to lack an
> /sbin/mount_union command, although it's cross-referenced from
> mount(8). I think Apple should hire the wonderful Thomas Klausner,
> who has made such a difference to the NetBSD manual pages).
> 
> Regards,
> Alistair

This sounds really nice. Would you elaborate how it works?

Regards,
Masao