[Samba] where to locate smb.conf for Samba4

[steve]

Hi

If I run the samba binary from a git and do a default install, I find 
smb.conf
  in
/usr/local/samba/etc/smb.conf
Fine.

What about running the separate smbd, nmbd and winbindd binaries instead 
of samba?

Do I still write my smb.conf in /usr/local/samba/etc/smb.conf?

Question/summary/comment
Could anyone please confirm where is smb.conf for:
1. Samba4 AD
2. Samba4 winthout AD running smbd, nmbd and winbindd in the sbin directory.
3. For distros with 3.x, I don't have to install Samba4 at all and find 
smb.conf in /etc/samba/smb.conf

Cheers,
Steve