Ok so while I was creating documentation for the Wiki for using the Samba function on Mac and Ubuntu I came across a few bugs.
First off is the issue that Samba reports no space available.
On both Mac and on Ubuntu, Samba reports that the disk has 0 bytes available.
So when trying to copy files, Mac will say not enough space and will not let you copy anything.
And Ubuntu will say not enough space, but I can say copy anyway and then it will copy the file.
I suspect this is because the root of the Samba share is not the drive, but the 'share' and this one is not writable does not have any space available. However this is only a theory.