Xavier Hernandez developed CephFS case sensitivity detection and reporting for the redox-os/samba repository, focusing on improving cross-platform file system interoperability. He implemented detection by reading the ceph.dir.casesensitive extended attribute, then optimized performance by caching the capability to avoid repeated attribute reads. The results were exposed through statvfs FsCapabilities, enabling clients to accurately determine file system behavior and reducing issues in cross-environment operations. Working primarily in C, Xavier applied his expertise in CephFS integration, extended attributes, and VFS module development. The work demonstrated a deep understanding of file system capabilities and laid the foundation for broader CephFS feature exposure.