daemon/graphdriver/driver_unsupported.go - third_party/github.com/moby/moby - Git at Google

 // +build !linux

 package graphdriver

 func GetFSMagic(rootpath string) (FsMagic, error) {
 	return FsMagicUnsupported, nil
 }
	// +build !linux

	package graphdriver

	func GetFSMagic(rootpath string) (FsMagic, error) {
	return FsMagicUnsupported, nil
	}