Filter Streaming API


I am not able to understand the limits of the Filter API. If I use a bounding box for a relative small location lets say for example dublin where the total number of tweets is quite less than the rate from the sample stream am I able to receive all the tweets posted?
For example:
Sample stream lets say 100 tweets/sec.
All Dublin Tweets: 10 tweets/sec

Will the filter stream return to me 10 tweets/sec?