+int nfs_nfs_proto_family(struct mount_options *options, sa_family_t *family);
+int nfs_mount_proto_family(struct mount_options *options, sa_family_t *family);
+int nfs_nfs_version(struct mount_options *options, unsigned long *version);
+int nfs_nfs_protocol(struct mount_options *options, unsigned long *protocol);
+