Reachability lists in git

The "git rev-list A ^B" command lists all the commits that are reachable from A but not from B. Is there a comparable command for the converse relation, that is, a command to list all the commits that A is reachable from but B isn't?

And if there is such a command, can the output be limited to just the latest commits? That is, list commit X if and only if A is reachable from X, B isn't reachable from X, and B is reachable from each of X's children?

Thanks,

Alan Stern