Comment 30 for bug 442130

@ artinP (bircoe):

Thanks for the link, but it did not address the issue of duplicated entries for samba shares.
It did, however, contain other useful piece of information: mounting protected samba shares without a credentials file.

Regarding the duplicated issue, I think the problem has to do with /etc/fstab, /etc/mtab, and the way nautilus reads those files.

Once an entry in /etc/fstab is mounted, it appears in /etc/mtab, but for some reason (usually when not using default options), the mtab entry is different from the fstab entry. When nautilus reads the two files, it gets confused, and shows both the fstab entry and the mtab entry.