kfilesystem: recognize nfs4 as KFileSystemType::Nfs
Some distro can use nfs4 as filesystem type for NFS v4
https://www.ibm.com/docs/en/ftmfm/4.0.5?topic=offering-network-file-system-nfs-version-4 https://help.ubuntu.com/community/NFSv4Howto
Some distro can use nfs4 as filesystem type for NFS v4
https://www.ibm.com/docs/en/ftmfm/4.0.5?topic=offering-network-file-system-nfs-version-4 https://help.ubuntu.com/community/NFSv4Howto