I've told you what I know: reviews say QC2.0, Samsung don't seem to advertise (presumably because if their adaptive charging is based on QC2.0 this might look "old" if they tell people).
My own Anker has QC3.0 and IQ, and I assume it would handle a QC2.0 device fine - as I say, these things are supposed to be backward compatible, and in general the device controls charging and the charger just has to be able to supply what's needed.