query GetProduct {
    product(slug: "oil-can") {
        id
        name
        variants {
            id
            stockLevels {
                stockLocation {
                    name
                }
                stockOnHand
            }
        }
    }
}      
{
  "variants": [
    {
      "id": "89",
      "stockLevels": [
        {
          "stockLocation": {
            "name": "Default Stock Location"
          },
          "stockOnHand": 22
        },
        {
          "stockLocation": {
            "name": "Bob's Parts Warehouse"
          },
          "stockOnHand": 10
        }
      ]
    }
  ]
}