Which color filter do I use for a black & white portrait?

I know color filters "block out" colors opposite to the color of the filter, and when used in black & white photography, can brighten or darken the object depending on its color and the color of the filter.

So I was wondering, when doing b&w photography, is there something like a "go to" color filter for portraits, some that smooths skin tones, etc.? Or is it situational, depending on our lighting conditions, to compensate for color casts caused by environment, or blocking out colors in the background, making the person seem brighter to make them pop, or something like that?

Edit: I should note I was primarily asking for film black & white photography, but it is always good to know both sides, so answers for digital are also appreciated.