how is option '--support' (mininum support required to report a variant) defined?

how is option '--support' (mininum support required to report a variant) defined? are there differences between '--support' and option '-m' (minimum sample weight for a call), '-mw' (minimum weight across all samples for a call) and '-msw' (minimum per-sample weight for a call) in lumpy?

I think I need to change these parameters for samples with different sequencing depth.