Blacklist files greater than a certain size from inputs.conf

Hi All, I have to monitor a folder where there are very huge files with file name automatically generated. Is there some way (instead of write a custom UNIX script that moves only small files to another folder that will be then monitored by the forwarder) to blacklist files that have a size greater than (suppose) 10 MB? Any other suggestion with Splunk stanza attributes is appreciated. Thanks a lot, Edoardo