As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
<groupId>hudson.plugins.filesystem_scm</groupId>
<artifactId>filesystem_scm</artifactId>
<version>120.vea_35eee5d63f</version>
</dependency>