code: func NewNSEnter(mounter mount.Interface, ne *nsenter.Nsenter, rootDir string) Interface {
  	return &subpathNSE{
  		mounter: mounter,
  		ne:      ne,
  		rootDir: rootDir,
  	}
  }
docs: // NewNSEnter returns a subpath.Interface that is to be used with the NsenterMounter
  // It is only valid on Linux systems