func UnprepareLayer(ctx context.Context, path string) (err error) {
	title := "hcsshim::UnprepareLayer"
	ctx, span := trace.StartSpan(ctx, title)  
	defer span.End()
	defer func() { oc.SetSpanStatus(span, err) }()
	span.AddAttributes(trace.StringAttribute("path", path))
	err = unprepareLayer(&stdDriverInfo, path)
	if err != nil {
		return hcserror.New(err, title+" - failed", "")
	}
	return nil
}
UnprepareLayer disables the filesystem filter for the read-write layer with
the given id.
package wclayer
import (
	"context"
	"github.com/Microsoft/hcsshim/internal/hcserror"
	"github.com/Microsoft/hcsshim/internal/oc"
	"go.opencensus.io/trace"
)