diff --git a/packages/istanbul-reports/lib/html-spa/src/getChildData.js b/packages/istanbul-reports/lib/html-spa/src/getChildData.js
index 8b09b327..42e5de01 100644
--- a/packages/istanbul-reports/lib/html-spa/src/getChildData.js
+++ b/packages/istanbul-reports/lib/html-spa/src/getChildData.js
@@ -30,18 +30,21 @@ function filterByFile(nodes, fileFilter, parentPath) {
     for (let i = 0; i < nodes.length; i++) {
         const child = nodes[i];
         const childFullPath = (parentPath ? parentPath + '/' : '') + child.file;
-        if (
-            childFullPath === fileFilter ||
-            childFullPath.indexOf(fileFilter) < 0
-        ) {
-            if (fileFilter.indexOf(childFullPath) === 0) {
-                // flatten
-                children = [
-                    ...children,
-                    ...filterByFile(child.children, fileFilter, childFullPath)
-                ];
-            }
-        } else {
+
+        const isChildUnderFilter =
+            fileFilter === childFullPath ||
+            fileFilter.indexOf(childFullPath + '/') === 0;
+        const isChildAboveFilter =
+            childFullPath.indexOf(fileFilter + '/') === 0;
+
+        if (isChildUnderFilter) {
+            // flatten and continue looking underneath
+            children = [
+                ...children,
+                ...filterByFile(child.children, fileFilter, childFullPath)
+            ];
+        } else if (isChildAboveFilter) {
+            // remove the parent path and add everything underneath
             const charsToRemoveFromFile =
                 fileFilter.length - (parentPath ? parentPath.length : 0);
             let childFilename = child.file.slice(charsToRemoveFromFile);