Just so you know, when you use "smb://..." you are mounting it locally. You just may not like the mount point it automatically created.
My nas folder is at
but to access it as local drive i mounted it like this in a fstab
You didn't specify what version of Ubuntu you are using:
If it's 12.10 the mount point is at:
Prior to that it was at:
//192.168.1.120/public/ /media/public smbfs uid=guest,gid=users 0 0
Assuming of course that you personally are a member of the "users" group.
//192.168.1.120/public/ /media/public smbfs uid=guest,gid=users,dir_mode=0775,file_mode=0664 0 0