Thanks for this little how-to. It has some very good info on things to watch out for with QB on samba. Just wondering are you using any of the following directives on your quickbooks share?

create mask = 0666
force user = quickbooks # this is a really powerful option.
force create mode = 0666
directory mask = 0777
force directory mode = 0777

These might make your and your clients life easier.

Regards,

cooper