Selectively download StackDriver files from google storage buckets with google input plugin

I'd like to selectively download StackDriver log files from google storage bucket. The bucket is created for forwarding StackDriver logs and is therefore arranged in a directory fashion i.e. logs-bucket/ I am using the google storage input plugin. I have achieved something similar with the logstash input plugin for AWS, using the prefix key as described here. Is this also possible for dowloading logs from GCS buckets?