Solid Hardwood, Engineered and Laminate Flooring - Cracks in concrete slab below floating floor

I am prepping to install a click-together, engineered Bamboo floating floor, and part of it will be on concrete. While removing the carpet and prepping, I have found that there are a couple of cracks in the slab. The cracks are several feet in length, but no wider than a quarter at any point. The house is 20 years old, and I am assuming that some cracking in a slab foundation is inevitable in a house that is old enough to have fully settled. I'm guessing most houses on a slab foundation will have some cracking in the slab due to settling, but that it is simply hidden beneath the flooring. Am I correct? Do I need to do anything to close the cracks beyond putting down the normal vapor barrier?

If I wasn't replacing the flooring, then I would have never known they were there, and I have not seen any signs of moisture. I don't know if it is relevant, but the house is a tri-level, and in the crawl space that is under part of the house, the ground is dry as a bone, even during the wettest part of the year.

Thanks,
Matt

Sorry no one got to this earlier. Your assessment is correct. In that amount of time, it's safe to assume the slab has done what it's going to do. I think I'd go ahead and fill the cracks just for my own peace of mind, but I wouldn't think it would be required. That's supposed to be one of the advantages of floating floors.