Feature: Confine trace, or exclude paths

(Use case: find project files to build)

I'd like to be able to trace project files only, excluding dependencies in e.g. node_modules.

I imagine either setting a directory scope that confines the dependency trace, e.g. "trace-deps --scope ./src", or else setting a set of paths for exclusion, e.g. "trace-deps --exclude ./node_modules" would be useful here.