Because everyone does that, it's fair game to try. It's also professional not to share confidential information. I would simply say that I can't discuss these

Because everyone does that, it's fair game to try. It's also professional not to share confidential information. I would simply say that I can't discuss these details, if pushed then make the point stronger why saying that I won't discuss them. But it can also be useful to hint that you know a lot. You should be selling yourself after all.