listFolderLongpoll().changes return true when changes in any folder, not in specified folder

``` kotlin
fun getDir(path: String) {
var result = client.files().listFolderBuilder(path)
.withLimit(500)
.withIncludeDeleted(true)
.withRecursive(false)
.start()
while (true) {
if (!result.hasMore) {
startLongPoll(result.cursor)
break
}
result = client.files().listFolderContinue(cursor)
}
}

fun startLongPoll(cursor: String) {
client.files().listFolderLongpoll(cursor, 30).changes // returns true if any changes in account, not in path specified with listFolderBuilder(path)
}
```