isi smb shares modify mktg-share --zone=marketing --file-filtering-enabled=yes --file-filter-extensions=.jpg --file-filter-type=deny 

isi smb shares view mktg-share --zone marketing | grep "File Filter" #verify

#Similarly, you can add file filters to an access zone using
isi file-filter settings modify
#The file filter on an SMB shares takes precedence over the filter filter on the access zone where the share reside