question: have diff output ignore additions

From https://github.com/google/go-cmp/blob/v0.5.9/cmp/compare.go#L113
> Diff returns a human-readable report of the differences between two values:
// y - x. ...
> func Diff(x, y interface{}, opts ...Option)

Is there a way to ignore things added in`y` in the output? I realize I could post process the diff output and drop lines with `+` but without the preceeding `-` but wondering if there's a better way.