Yes, that's a perfect example.Do you mean something like this?
Peter tends to exaggerate. I take what he says with a grain of salt.
Note that "a pinch of salt" is also used in that idiom.
https://www.lexico.com/definition/take_something_with_a_pinch_of_salt
In AmE I would expect to see/hear "pinch of salt" used only in recipes.
I've only heard "a grain of salt" in the United States. We've discussed this US/British difference before.
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