diff --git a/vendor/github.com/coreos/etcd/clientv3/namespace/lease.go b/vendor/github.com/coreos/etcd/clientv3/namespace/lease.go
new file mode 100644
index 0000000..f092106
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/clientv3/namespace/lease.go
@@ -0,0 +1,57 @@
+// Copyright 2017 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package namespace
+
+import (
+	"bytes"
+	"context"
+
+	"github.com/coreos/etcd/clientv3"
+)
+
+type leasePrefix struct {
+	clientv3.Lease
+	pfx []byte
+}
+
+// NewLease wraps a Lease interface to filter for only keys with a prefix
+// and remove that prefix when fetching attached keys through TimeToLive.
+func NewLease(l clientv3.Lease, prefix string) clientv3.Lease {
+	return &leasePrefix{l, []byte(prefix)}
+}
+
+func (l *leasePrefix) TimeToLive(ctx context.Context, id clientv3.LeaseID, opts ...clientv3.LeaseOption) (*clientv3.LeaseTimeToLiveResponse, error) {
+	resp, err := l.Lease.TimeToLive(ctx, id, opts...)
+	if err != nil {
+		return nil, err
+	}
+	if len(resp.Keys) > 0 {
+		var outKeys [][]byte
+		for i := range resp.Keys {
+			if len(resp.Keys[i]) < len(l.pfx) {
+				// too short
+				continue
+			}
+			if !bytes.Equal(resp.Keys[i][:len(l.pfx)], l.pfx) {
+				// doesn't match prefix
+				continue
+			}
+			// strip prefix
+			outKeys = append(outKeys, resp.Keys[i][len(l.pfx):])
+		}
+		resp.Keys = outKeys
+	}
+	return resp, nil
+}