Determining capabilities of existing custom post types

I’m working on adding a feature to the “User Submitted Posts” plugin which would allow admins to submit posts from the frontend to a custom post type. (instead of post)

I’d like the plugin to be able to figure out which capabilities are supported for a selected custom post type, so the settings for the plugin wouldn’t allow the admin to, say “allow image uploads” for a certain post type which did not allow such a capability. Is there a way to check capabilities for custom post types that already exist in the environment?

thanks!