NETATALK limitsize question

Hi, I have a problem with Netatalk 1.5 from SuSE 7.3. In short, in order old Macs get working with 40 GB shared volume NETATALK should report that share size is only 2 GB, otherwise old Mac recognizes 22 MB folder with a lot of small files as being over 400 MB (old MacOS does understands only volumes with fixed number of sectors). NETATALK has an option called limitsize, however, I have been unable to get it working. I have tried "~ option:limitisize", "~ limitsize:2048000000", "~ option:limitisize:2048000000". I have removed all other options, but it does not seem working anyway. It seems this options is just being ignored (or may be I have used wrong syntax?). Thanks in advance for any suggestions. Andrei