It could be done as files without the wierd ownership model that unix has.
So:
/
/files-and-that/
/files-and-that/home/
/files-and-that/home/disgustedoftunbridgewells
/disks-n-stuff/
/networks-or-whatever
/.pr0n/
etc, with /files-and-that containing what on linux would be /, but dev split into /disks-n-stuff, networks-or-whatever and so on.