If on remote Samba server there is shared folder which has sharename longer
than 13 symbols it is not browseable. 

For example if on remote Samba server Samba there is a shared folder with
sharename name_which_is_way_longer_than_13_symbols, and I would go with
nautilus to
smb://Samba, 
then the same folder will be displayed as name_which_is and nautilus will
show that it has ? items. If you double click on that folder, then nautilus
will display error message:

Nautilus cannot display "smb://Samba/name_which_is"

It is interesting that this restriction applies only to folders which are
shared on Samba server. If for example there is a folder shared with name
short_name and it has a subfolder another_name_which_is_too_long going to

smb://Samba/short_name

everything is displayed properly, and subfolder
another_name_which_is_too_long is browseable.

Using smbclient I can connect to folders with long names:

smbclient //Samba/name_which_is_way_longer_than_13_symbols

works perfectly. 

I suspect it is somehow related to smbclient, because

smbclient -L //Samba

displays first 13 symbols of shared folder names.

Since I noticed this bug I have upgraded Gnome2 from Sid few times, but the
bug is still there.