[Samba] How to disallow to create files with bad charracters

[Dusan Zatkovsky]

Hi.

I would like to ask you, if it is possible to disallow to create files which 
contains 'bad' charracters in filenames.

I have blocked filenames with national charracters by specifying
unix charset = ascii, but it is still possible to create file named:
"my stupid file ... . . .doc".

I'd like to disallow this ( allowing only alphanums and underscore 
["my_stupid_file.doc"] ).

Is it possible?

Thank you.

-- 
Dusan