samba - Sep 2003 - log file = /usr/local/samba/var/log.%m , %U ?

Hi Sambatistas,
man files says 
log file (G)
This option allows you to override the name of the Samba log file (also
known as the debug file).

This option takes the standard substitutions, allowing you to have separate
log files for each user or machine.

Example: log file = /usr/local/samba/var/log.%m

Is there a way to have both ,a user and a machine log file ?
somthing like 
log file = /usr/local/samba/var/log.%m , %U
Best Regards 

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