Mustard-Green Onion Potato Salad

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3 pounds new potatoes, boiled and sliced into 1/4-inch thick rounds

4 green onions, thinly sliced

1 cup mayonnaise

3 tablespoons Dijon mustard

3 tablespoons whole grain mustard

2 cloves garlic, finely chopped

3 tablespoons white wine vinegar

1/4 cup chopped parsley

Salt and freshly ground pepper