os level (G)
              This integer value controls what level Samba advertises itself as  
for browse elections. The value of this parameter determines whether nmbd(8) has
 a chance of becoming a local master browser for the  WORKGROUP in the local bro
adcast area.
 
              Note :By default, Samba will win a local master browsing election  
over all Microsoft operating systems except a Windows NT 4.0/2000 Domain Control
ler. This means that a misconfigured Samba host can effectively isolate a subnet
 for browsing purposes. See BROWSING.txt  in the Samba docs/ directory for detai
ls.
 
              Default: os level = 20
 
              Example: os level = 65