vendor: update fsutil to 2862f6bc

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor.conf

@@ -40,7 +40,7 @@ golang.org/x/time f51c12702a4d776e4c1fa9b0fabab841babae631
 github.com/docker/docker 71cd53e4a197b303c6ba086bd584ffd67a884281
 github.com/pkg/profile 5b67d428864e92711fcbd2f8629456121a56d91f
 
-github.com/tonistiigi/fsutil f567071bed2416e4d87d260d3162722651182317
+github.com/tonistiigi/fsutil 2862f6bc5ac9b97124e552a5c108230b38a1b0ca
 github.com/hashicorp/go-immutable-radix 826af9ccf0feeee615d546d69b11f8e98da8c8f1 git://github.com/tonistiigi/go-immutable-radix.git
 github.com/hashicorp/golang-lru a0d98a5f288019575c6d1f4bb1573fef2d1fcdc4
 github.com/mitchellh/hashstructure 2bca23e0e452137f789efbc8610126fd8b94f73b

vendor/github.com/tonistiigi/fsutil/walker.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"syscall"
 	"time"
 
 	"github.com/docker/docker/pkg/fileutils"
@@ -71,7 +72,7 @@ func Walk(ctx context.Context, p string, opt *WalkOpt, fn filepath.WalkFunc) err
 			return err
 		}
 		defer func() {
-			if retErr != nil && os.IsNotExist(errors.Cause(retErr)) {
+			if retErr != nil && isNotExist(retErr) {
 				retErr = filepath.SkipDir
 			}
 		}()
@@ -216,3 +217,14 @@ func trimUntilIndex(str, sep string, count int) string {
 		}
 	}
 }
+
+func isNotExist(err error) bool {
+	err = errors.Cause(err)
+	if os.IsNotExist(err) {
+		return true
+	}
+	if pe, ok := err.(*os.PathError); ok {
+		err = pe.Err
+	}
+	return err == syscall.ENOTDIR
+}