func NewRootFS() *RootFS {
	return &RootFS{Type: TypeLayers}
}
NewRootFS returns empty RootFS struct
package image
import (
	"runtime"
	"github.com/Sirupsen/logrus"
	"github.com/docker/docker/layer"
)
const TypeLayers = "layers"
const typeLayersWithBase = "layers+base"
type RootFS struct {
	Type    string         `json:"type"`
	DiffIDs []layer.DiffID `json:"diff_ids,omitempty"`
}