Mininum quantity extension

Hi all,
I have searched and searched for a module, but can't find what I'm looking for.

I have minimum quantities, so example, minimum quantity 100. But what I want is for the minimum quantity to be bought in multiples. So next would be 200, 300, 400 etc, at the moment somebody can buy 101, 102 etc.

Thanks for any help

Such as this?
Forced Min Quantity Stepping (1.5.x/2.x)