Set size limit to share folders on my samba server(Ubuntu server 14.04)
 

I have a samba system setup on my ubuntu server. There are three folders being shared and I can successfully access them from my users windows machines. The next step i want to do is limit how much crap can be put in these folders. Each person in my house(3) has a folder and i'd like to limit it to about 30 gb each and then there is a public share that i'd like to limit as well. I understand that I can probably partition the drive and put each folder on a different partition but is there away to do this without having a bunch of partitions?