runtime/runtime_btrfs.go - third_party/github.com/moby/moby - Git at Google

 // +build !exclude_graphdriver_btrfs

 package runtime

 import (
 	_ "github.com/dotcloud/docker/runtime/graphdriver/btrfs"
 )
	// +build !exclude_graphdriver_btrfs

	package runtime

	import (
	_ "github.com/dotcloud/docker/runtime/graphdriver/btrfs"
	)