Add this to smb.conf:
****
[usrshare]
        path=/usr/share/
        guest ok = no
        browseable = yes
****
Or as example for sharing usershares.
This is generic shares which are found under each /home/username.
For instance 'mschr' has folder Videos and on smbd ubuntu installation, find and edit
'/var/lib/samba/usershares/videos'
(Note: I don't know what is the format of "usershare_acl", but this particular string seems to be used widely.)

****
#VERSION 2
path=/home/mschr/Videos
comment=
usershare_acl=S-1-1-0:F
guest_ok=n
sharename=MyVideos
****

For any client now asking for shares, for instance smbtree will find:
WORKGROUP
	\\ASUS
		\\ASUS\MyVideos      	
		\\ASUS\usrshare          	



On client computer run from terminal
****
sudo mkdir /mnt/rootowneddir/
sudo chown root:root /mnt/rootowneddir/
sudo chmod 775 /mnt/rootowneddir/
sudo mount -t cifs -o username=mschr,password=mscpass //ASUS/usrshare /mnt/rootowneddir
sudo mkdir /mnt/mschrvideos
sudo chown mschr:mschr /mnt/mschrvideos
sudo mount -t cifs -o username=mschr,password=mscpass //ASUS/MyVideos /mnt/mschrvideos
sudo mkdir /mnt/mschrXYZvideos
sudo chown mschrXYZ:mschrXYZ /mnt/mschrXYZvideos
sudo mount -t cifs -o username=mschrXYZ,password=mscpass //ASUS/MyVideos /mnt/mschrXYZvideos
****