Monitor File System Growth

We have a CIFS file share on our VNX 5300.  Recently, we've seen a rapid growth in the storage consumption, but we're unable to pinpoint where the growth is occuring.  Are there any tools for monitoring the file system and tracking folder and sub-folder size over time?  Right now, we're just using freeware tools such SpaceSniffer and manually massaging the data into something we can sort of use, but it's very time consuming. 

Thank you,