pg_sample

I got a very big database, that I need to export (dump) into a new test server.

However, this new database test server doesn't need to have all the data. I would like to have only the first 100 rows(example) of each table in my database.

I'm using pg_sample to do that, but unfortunately it doesn't work well.

It doesn't get the first 100 rows. It gets random 100 rows.

Do you guys have any idea how could I do this?

Thanks

Patrick