samba - Dec 2015 - Share free size vs. filesystem free size - dont match

Hi,

we have a red hat el 6.7 server still with samba-3.6.23. I know that is
a bit old, but running fine for us most of the time.

After running slowly out of space on a share I checked the server and
saw this:

On my Mac OS X Client and a Windows 7 Client the share is shown with a
capacity of about 220 GB, 70GB free.

The filesystems the share is hosted on is 545GB in size and 32 GB free.

Quotas are enabled but unlimited for me.

Question: Why dose the clients show more than 2 times of free space as
the filesystem has?

Any ideas, suggestions, hints? (Updating to samba 4.x is not an option
yet ... but 2016 ;) )

	
	Thanks and regards . Götz