Imports of package snapshotter

PathSynopsis
github.com/containerd/containerd/mount
github.com/docker/docker/daemon/graphdriver
github.com/docker/docker/pkg/idtools
github.com/moby/lockerPackage locker provides a mechanism for creating finer-grained locking to help free up more global locks to handle other tasks.
github.com/sirupsen/logrusPackage logrus is a structured logger for Go, completely API compatible with the standard library logger.
golang.org/x/sys/unix
osPackage os provides a platform-independent interface to operating system functionality.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.