Documentation for exclude/include/only/ignore options

[bludin]

Is there some documentation on the exact functionality of the exclude/include/only/ignore options? It is not immediately obvious to me what the above filters apply to, particularly in the context of purge=True (if have a situation where files and directories are created and deleted alternatingly, i.e. on every other run of a one-way sync with the exact same parameters).
TIA, Beat