fuse.4: Add list of undocumented messages

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man4/fuse.4

@@ -508,6 +508,45 @@ and
 if the FUSE filesystem was unmounted.
 .SH CONFORMING TO
 The FUSE filesystem is Linux-specific.
+.SH NOTES
+The following messages are not yet documented in this manual page:
+
+.in +8n
+.nf
+.BR FUSE_BATCH_FORGET
+.BR FUSE_BMAP
+.BR FUSE_CREATE
+.BR FUSE_DESTROY
+.BR FUSE_FALLOCATE
+.BR FUSE_FORGET
+.BR FUSE_FSYNC
+.BR FUSE_FSYNCDIR
+.BR FUSE_GETLK
+.BR FUSE_GETXATTR
+.BR FUSE_IOCTL
+.BR FUSE_LINK
+.BR FUSE_LISTXATTR
+.BR FUSE_LSEEK
+.BR FUSE_MKDIR
+.BR FUSE_MKNOD
+.BR FUSE_NOTIFY_REPLY
+.BR FUSE_POLL
+.BR FUSE_READDIRPLUS
+.BR FUSE_READLINK
+.BR FUSE_REMOVEXATTR
+.BR FUSE_RENAME
+.BR FUSE_RENAME2
+.BR FUSE_RMDIR
+.BR FUSE_SETATTR
+.BR FUSE_SETLK
+.BR FUSE_SETLKW
+.BR FUSE_SYMLINK
+.BR FUSE_UNLINK
+.BR FUSE_WRITE
+.fi
+.in
+.\" It looks like the following are undocumented so far. It probably would
+.\" be kind to list these in the man page
 .SH SEE ALSO
 .BR fusermount (1),
 .BR mount.fuse (8)