I'm not sure exactly. It depends on how you define a story within The Shard. Maybe you could look for a detailed index or summary to get a precise count.
In 'A Shard of Glass' short story, it might be about a single shard of glass which could symbolize many things. It could be a broken piece of a past, like a broken relationship or a shattered dream. For example, if the story is set in a post - apocalyptic world, the shard of glass could be a remnant of a once - great civilization's architecture, representing the loss and fragmentation of society.
It's a story that likely has a deep and specific meaning related to its characters and plot. But without reading it, it's hard to give a precise answer.