This is likely to be become a duplicate of #1920, but for the record ...

mount passes user options to smbmount, which passes these to smbmnt, which in
turn passes these to the mount system call, where smbfs checks these and
printk's a warning and fails the call if there is an unknown option.
As such, trying to mount an entry in fstab that is marked with noauto and/or
user (which implies nodev,noexec,nosuid), fails with "unrecognized mount option" 
(at least in SuSE 9.3, kernel version 2.6.11.4-20a-default).

In contrast, the more recommended CIFS suite only printk's a warning (and does
not fail the call), and mount.cifs also filters the options prior to passing
them along.

The following simplistic patch (on smbfs in the aforementioned version) would
prevent mount bailing out (as in CIFS).  Alternatively (more complicated),
smbmount or smbmnt could be adapted to filter options.
--- getopt.c    2005-03-02 08:38:13.000000000 +0100
+++ getopt.c.new        2005-10-14 22:44:28.000000000 +0200
@@ -62,3 +62,5 @@
        printk("%s: Unrecognized mount option %s\n", caller, token);
+/*     CIFS only issues warning also: does not fail
        return -1;
+*/
 }