[Samba] Solved for 1/1300?

[dkemper at intellisys-is.com]

Hello, 

Discrete Mathematics Question; how did the samba developers conclude that the default mangling method "hash" results in a probability-of-name-clash of 1/1300? 

Please note, I am not looking for samba solutions here, just intensely curious on how this number was solved for. 

For instance, 

Q: What is considered the sample space of all possible file names here, were the "-" and "_" taken into account? 

Q: Are we considering all possible filename are equally likely to occur? 

Jeremy A, perhaps you know? 

Daniel