Disk: only detect folders that specified by --disk-folders

Can be used to improve performance by ignoring network disks

src/detection/disk/disk_linux.c

@@ -250,7 +250,7 @@ static void detectStats(FFDisk* disk)
     #endif
 }
 
-const char* ffDetectDisksImpl(FFlist* disks)
+const char* ffDetectDisksImpl(FFDiskOptions* options, FFlist* disks)
 {
     FILE* mountsFile = setmntent("/proc/mounts", "r");
     if(mountsFile == NULL)
@@ -260,7 +260,12 @@ const char* ffDetectDisksImpl(FFlist* disks)
 
     while((device = getmntent(mountsFile)))
     {
-        if(!isPhysicalDevice(device))
+        if (__builtin_expect(options->folders.length, 0))
+        {
+            if (!ffDiskMatchMountpoint(options, device->mnt_dir))
+                continue;
+        }
+        else if(!isPhysicalDevice(device))
             continue;
 
         //We have a valid device, add it to the list