[Samba] Veto files with question mark

[OmBreNoiRe]

Hi !

I would like to remove from listing the "Icon?" files created by mac 
user when they customize their folder icon.

So I did in my smb.conf :
veto files = /Icon?/

ok it's working, but "Icone" "Iconx" "Icons" will be removed too. I 
tried veto files = /Icon\?/ but it's not working,
Is there a way to use question mark (?) but not as a wild-card ?

Thanks in advance for your answer,

Best regards,

OmBreNoiRe