No, they don't of course. Maybe 99% (or more) resumes are full of fake info or included what entire department did. I help our clients to find the right people for positions and this is a daily challenge.
I don't believe that, or at least I think 99% is a considerable exaggeration. My resume has never been based on anything but what I did, because every person I've worked with in a department has a different role. I couldn't take credit for their work because it's palpably not what I do. And if I did, I'd end up doing similar things, which is not what I want or I already would've been doing them.
I think you might be surprised, I have had people standing right in front of me take credit for my own work. The reason we have such byzantine interviews in this industry is because you cannot trust what most people put in their CV.
