local master

This option allows nmbd 8 to try and become a local master browser on a subnet. If set to no then nmbd will not attempt to become a local master browser on a subnet and will also lose in all browsing elections. By default this value is set to yes. Setting this value to yes doesn't mean that Samba will become the local master browser on a subnet, just that nmbd will participate in elections for local master browser.
Setting this value to no will cause nmbd never to become a local
master browser.

Supported on: At least Microsoft Windows 7 or Windows Server 2008 family

local master
Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Samba\smb_conf\local master
Value Namelocal master
Value TypeREG_DWORD
Default Value1
True Value1
False Value0

samba.admx

Administrative Templates (Computers)