Do not skib directories of last_path files

src/main/java/org/embulk/input/filename/FilenameFileInputPlugin.java

@@ -118,12 +118,12 @@ public class FilenameFileInputPlugin
                 {
                     if (path.equals(directory)) {
                         return FileVisitResult.CONTINUE;
-                    } else if (lastPath != null && path.toString().compareTo(lastPath) <= 0) {
+                    } else if (lastPath != null && path.toString().compareTo(lastPath.substring(0, path.toString().length())) < 0) {
+                        return FileVisitResult.SKIP_SUBTREE;
+                    } else if (path.getFileName().toString().startsWith(".")) {
                         return FileVisitResult.SKIP_SUBTREE;
                     } else {
-                        // Skip hidden 
-                        if (!path.getFileName().toString().startsWith(".") &&
-                                path.getFileName().toString().startsWith(fileNamePrefix)) {
+                        if (path.getFileName().toString().startsWith(fileNamePrefix)) {
                             return FileVisitResult.CONTINUE;
                         } else {
                             return FileVisitResult.SKIP_SUBTREE;
@@ -131,17 +131,17 @@ public class FilenameFileInputPlugin
                     }
                 }
 
+
                 @Override
                 public FileVisitResult visitFile(Path path, BasicFileAttributes attrs)
                 {
                     if (lastPath != null && path.toString().compareTo(lastPath) <= 0) {
                         return FileVisitResult.CONTINUE;
+                    } else if (path.getFileName().toString().startsWith(".")) {
+                         return FileVisitResult.CONTINUE;
                     } else {
-                        // Skip hidden
-                        if (!path.getFileName().toString().startsWith(".") && 
-                                path.getFileName().toString().startsWith(fileNamePrefix)) {
+                        if (path.getFileName().toString().startsWith(fileNamePrefix)) {
                             builder.add(path.toString());
-                            return FileVisitResult.CONTINUE;
                         }
                         return FileVisitResult.CONTINUE;
                     }