@@ -405,13 +405,7 @@ func getSourceMount(source string) (string, string, error) {

 			idx = i

 		}

 	}

-	// and return it unless it's "/"

-	if mi[idx].Mountpoint != "/" {

-		return mi[idx].Mountpoint, mi[idx].Optional, nil

-	}

-

-	// If we are here, we did not find parent mount. Something is wrong.

-	return "", "", fmt.Errorf("Could not find source mount of %s", source)

+	return mi[idx].Mountpoint, mi[idx].Optional, nil

 }

 const (

@@ -1,6 +1,7 @@

 package daemon // import "github.com/docker/docker/daemon"

 import (

+	"os"

 	"testing"

 	containertypes "github.com/docker/docker/api/types/container"

@@ -86,3 +87,16 @@ func TestIpcPrivateVsReadonly(t *testing.T) {

 		assert.Check(t, is.Equal(false, inSlice(m.Options, "ro")))

 	}

 }

+

+func TestGetSourceMount(t *testing.T) {

+	// must be able to find source mount for /

+	mnt, _, err := getSourceMount("/")

+	assert.NilError(t, err)

+	assert.Equal(t, mnt, "/")

+

+	// must be able to find source mount for current directory

+	cwd, err := os.Getwd()

+	assert.NilError(t, err)

+	_, _, err = getSourceMount(cwd)

+	assert.NilError(t, err)

+}