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Pluto Sampling Rate + Filters Question

This is what I think I understand by reading the Pluto RX documentation (I am only concerned with the RX at the moment),

1) If I set the sampling rate using: ad9361_set_bb_rate(), the function automatically sets the required setups, decimaters + filters based on the figure 1 attached (from the wiki), then the sampling rates possible are 520 KHz to ??? MHz.

2) If I set the sampling rate using: ad9361_set_bb_rate_custom_filter_auto(), the function automatically sets the required setups, decimaters + filters based on this simple formula:

Fpass = rate / 3    and     Fstop = Fpass * 1.25

What are the permissible sampling rates for this function?

 3) Do I have to set any other attributes such as: filter_fir_en to use these functions?

4) Do these functions do anything to the: rf_bandwidth, I assume I need to do that myself?

There are a few other filter setters, but once I understand these two I can probably figure out the others.

Thanks for the help,

Steve Hageman