changeToParentDirectory method
void
changeToParentDirectory()
Implementation
void changeToParentDirectory() {
var parentDir = Directory(currentDirectory).parent;
if (_isPathAllowed(parentDir.path) && parentDir.existsSync()) {
currentDirectory = parentDir.path;
sendResponse('250 Directory changed to $currentDirectory');
} else {
sendResponse('550 Access denied or directory not found');
}
}