The HFS Prefix is not required, depending on the implicit prefix selection algorithm specified in the IMPPREFIX site attribute.

If the system administrator has not specified an implicit prefix selection, then to access z/OS UNIX files, you must know the HFS prefix defined by your system administrator (the default is /hfs). You can use the showattr command to display the HFS prefix defined for your location. You use this prefix in your mount command before the path name of the z/OS UNIX directories that you are mounting. The HFS prefix is used by the NFS server to distinguish z/OS UNIX directories from z/OS conventional MVS data sets, but the HFS prefix isn't part of the path name that you see. After you have entered the mount command, you access HFS files using the local mount point.

See z/OS NFS File System Type Selection for more information on selecting NFS file system types.