Update list statuses to use filters

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

metadata/adaptors.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"github.com/containerd/containerd/containers"
+	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/filters"
 	"github.com/containerd/containerd/images"
 )
@@ -69,6 +70,20 @@ func adaptContainer(o interface{}) filters.Adaptor {
 	})
 }
 
+func adaptContentStatus(status content.Status) filters.Adaptor {
+	return filters.AdapterFunc(func(fieldpath []string) (string, bool) {
+		if len(fieldpath) == 0 {
+			return "", false
+		}
+		switch fieldpath[0] {
+		case "ref":
+			return status.Ref, true
+		}
+
+		return "", false
+	})
+}
+
 func checkMap(fieldpath []string, m map[string]string) (string, bool) {
 	if len(m) == 0 {
 		return "", false