Right click on features inside the part. The properties will tell you who made that particular feature, and when. I suppose a macro could be written to extract that quickly from all the features.
I am an instructor at a University and I use this all the time and tell my students I can see who created the original, not who last saved.
years ago it was in the property summary then it was gone. now just do what Steve said and all is good.
This is why I give a 2hr final exam!!!!
Have students that are getting A's for the homework and quizzes...BUT FAIL the final because they never did their own work.
This is the only way to see if each person understands how the software works, and the parts and assembies are simple.
In the end cheaters never win! from an A to C or worse because they never did their own work.
I also tell them this "SolidWorks" is their professional XBox or "Call of Duty" mindless hours of gameplay makes you an awsome modeler and will make you a desired future employee.