What command provides detailed information about filesystems and their usage?

The command that provides detailed information about filesystems and their usage is the one that displays the amount of disk space used and available on filesystems. In this context, the df command is specifically designed for that purpose. When used with the -h option, it displays the disk space in a human-readable format, making it easier for users to comprehend the data.

The du command, while it provides information about disk usage, focuses on the size of directories and files rather than the overall filesystem. Therefore, it doesn't serve the purpose of displaying information about the filesystem as a whole.

The ls -l command lists files and directories with detailed information, such as permissions, ownership, and modification times, but does not provide any details about filesystem usage.

The mount command is used to attach filesystems and does not report on usage statistics. It is useful for managing filesystems but doesn't provide information about their utilization.

In summary, for comprehensive details about filesystems and their usage, the df -h command is the correct choice, as it gives a clear overview of disk space, while the other commands serve different functions.