https://unix.stackexchange.com/a/97764/674 says that nfs service isn't userspace process
Another option is that the socket doesn't belong to a process, it belongs to the kernel. One common example of this is NFS.
Does NFS follow the server-client model?
If yes, where and how are its server and its client running? How can I verify that? Are both NFS server and client run as modules to kernel?
The purpose of my question is to understand some sketch of the architecture of NFS.