How to tell which dependency enables a feature?

I have a large project and many crates in it import the \chrono\\ crate. That crate has an optional feature, enabled by default, called \oldtime\\ which in turn imports \time@0.1.43\\.

I'd like to figure out which crate in my project is importing \chrono\\ with its \oldtime\\ feature enabled. Most of them don't, but I know at least one of them is. Is there any way to find this data without checking each one individually? It doesn't show up in \cargo tree\\ as far as I can tell.