Afaik as I've been able to figure out, it should be possible to implement the plan9 filserver in userspace, and combine user-mode file-sharing with convenience

Afaik as I've been able to figure out, it should be possible to implement the plan9 filserver in userspace, and combine user-mode file-sharing with convenience and performance (esp. for a local host). Unfortunately, I've never been able to find a combination of utilities that actually work and allow this. Which I guess leaves user-mode nfs - or more exotic things like ipfs.