Kielbasa, Potato and Leek Gratin

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4 tablespoons butter

1 1/2 cups minced leeks, white and light green parts only

3 tablespoons flour

2 cups milk, heated

1/4 cup grated Gruyere cheese

1/4 cup grated Parmesan cheese

1 tablespoon Dijon mustard

Salt, pepper and freshly-grated nutmeg

1 large garlic clove, peeled

2 large Idaho potatoes, peeled and sliced

1 1/2 pounds smoked kielbasa, diced

1/3 cup buttered bread crumbs