docker/tarfile/dest.go
func (d *Destination) sendBytes(path string, b []byte) error {
	return d.sendFile(path, int64(len(b)), bytes.NewReader(b))
}
func (d *Destination) sendBytes(path string, b []byte) error {
	return d.sendFile(path, int64(len(b)), bytes.NewReader(b))
}
// sendBytes sends a path into the tar stream.