FreeBSD has this (mount_portalfs, whose man page references the paper you link to), though I've only messed with it sparingly out of curiosity. Not sure how st

FreeBSD has this (mount_portalfs, whose man page references the paper you link to), though I've only messed with it sparingly out of curiosity. Not sure how stable it is, but I thought it was really cool when I stumbled upon it one day.