parent of root - remembering Apollo/Domain OS

Decades ago I worked in a lab equipped with Apollo/Domain workstations. One of the niceties of these machines was that their filesystems where organised and accessible as directories in what appeared to be the parent of an individual machine's root directory. You accessed that "super root" with //; your home directory would be //$HOST/$HOME. It would be really nice to have such an automatic networked filesystem at home. Is there any software that does something similar (for Linux & Mac)? EDIT: as an example of something I don't see how you'd do it with the protocols mentioned below, here's something a bit sneaky I used to do: - Set up a directory of mine in a writable portion of fast harddisk space on the fastest machine on the LAN, IIRC something like mkdir -p //fysae/tmp/.bertin/home, copy login scripts and work stuff there, and then setenv HOME "//fysae/tmp/.bertin/home" (this is also where I picked up my addition to [t]csh). All that was done with shell commands which is also where I did all my work. BTW, another nice feature made all this more transparent; it was possible to reference an env. variable in symlinks so their target depended on that variable.