diff --git a/src/Psalm/Internal/Provider/FakeFileProvider.php b/src/Psalm/Internal/Provider/FakeFileProvider.php
index 7cafa391b..d2ffb9910 100644
--- a/src/Psalm/Internal/Provider/FakeFileProvider.php
+++ b/src/Psalm/Internal/Provider/FakeFileProvider.php
@@ -57,12 +57,13 @@ class FakeFileProvider extends FileProvider
 
     /**
      * @param array<string> $file_extensions
+     * @param null|callable(string):bool $directory_filter
      *
      * @return list<string>
      */
-    public function getFilesInDir(string $dir_path, array $file_extensions): array
+    public function getFilesInDir(string $dir_path, array $file_extensions, callable $directory_filter = null): array
     {
-        $file_paths = parent::getFilesInDir($dir_path, $file_extensions);
+        $file_paths = parent::getFilesInDir($dir_path, $file_extensions, $directory_filter);
 
         foreach ($this->fake_files as $file_path => $_) {
             if (strpos(strtolower($file_path), strtolower($dir_path)) === 0) {
diff --git a/src/Psalm/Internal/Provider/FileProvider.php b/src/Psalm/Internal/Provider/FileProvider.php
index ffbfb14f9..3f319ca13 100644
--- a/src/Psalm/Internal/Provider/FileProvider.php
+++ b/src/Psalm/Internal/Provider/FileProvider.php
@@ -2,7 +2,9 @@
 namespace Psalm\Internal\Provider;
 
 use FilesystemIterator;
+use RecursiveCallbackFilterIterator;
 use RecursiveDirectoryIterator;
+use RecursiveIterator;
 use RecursiveIteratorIterator;
 use UnexpectedValueException;
 
@@ -14,6 +16,8 @@ use function in_array;
 use function is_dir;
 use function strtolower;
 
+use const DIRECTORY_SEPARATOR;
+
 class FileProvider
 {
     /**
@@ -113,10 +117,11 @@ class FileProvider
 
     /**
      * @param array<string> $file_extensions
+     * @param null|callable(string):bool $directory_filter
      *
      * @return list<string>
      */
-    public function getFilesInDir(string $dir_path, array $file_extensions): array
+    public function getFilesInDir(string $dir_path, array $file_extensions, callable $directory_filter = null): array
     {
         $file_paths = [];
 
@@ -125,6 +130,16 @@ class FileProvider
             FilesystemIterator::CURRENT_AS_PATHNAME | FilesystemIterator::SKIP_DOTS
         );
 
+        if ($directory_filter !== null) {
+            $iterator = new RecursiveCallbackFilterIterator(
+                $iterator,
+                /** @param mixed $_ */
+                function (string $current, $_, RecursiveIterator $iterator) use ($directory_filter): bool {
+                    return !$iterator->hasChildren() || $directory_filter($current . DIRECTORY_SEPARATOR);
+                }
+            );
+        }
+
         /** @var RecursiveDirectoryIterator */
         $iterator = new RecursiveIteratorIterator($iterator);
         $iterator->rewind();