How do I access my enterprise NAS server by mounting NFS filesystem onto my Mac OS X based system using GUI and command line based tools? Network File System (NFS), a distributed file system protocol developed by Sun Microsystems. NFS is the common for file sharing on NAS server and Linux / UNIX systems like, HP-UX, Solaris, Mac OS X, and others. macOS (OS X) can be setup as an NFS client to acces