anchor: Texture:getMipmapFilter
  Gets the mipmap filter mode for a Texture. Prior to 11.0 this method only worked on Images.
  mode, sharpness = Texture:getMipmapFilter()
  mode FilterMode The filter mode used in between mipmap levels. nil if mipmap filtering is not enabled.
  sharpness number Value used to determine whether the image should use more or less detailed mipmap levels than normal when drawing.