samba - Feb 2007 - Any chance to make Samba pass full path into external dfree instead of ./?

Hi list,

At the moment I'm struggling with a problem when Samba returns 0 free space
for share which is in fact a reexported NFS automount point (in fact df also
returns zero here, so that's not a Samba fault, just a configuration
specifics).
One way around is usage of external dfree routine, which is mentioned in
manuals. I've almost managed this config to work by developing some script
which devises the full path using PID of smbd instance it is called by and
smbstatus utility, but there's a fundamental problem - one smbd can have
several files opened in different shares. Using my approach it is impossible to
find out which share is being accessed at each particular moment.
Therefore I'm trying other possibilities and this is one of them - can I
somehow tune the sourcecode in order to get full path passed to external dfree?
I've undertaken a short dig into sources and it seems to me possible, but it
would be great to get an answer from Samba developers - in order for me not to
waste the time just to come up to the fact it is impossible... So, any comments
and suggestions on how to do that are welcome. I'm open to provide any
additional details which may help.

Regards,
Alexander