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To view currently mounted filesystems and their details, the command "mount" is used. This command provides a list of all the filesystems that are currently mounted, showing their mount points as well as the types of filesystems. It typically outputs information such as the device name, the mount point, the filesystem type, and any mount options being used.

Using "mount" is particularly useful because it gives a comprehensive overview of the system's current state in terms of active filesystems. It allows system administrators to quickly verify what is mounted and where, which is critical for troubleshooting and system management tasks.

The other commands have different primary purposes. For instance, "lsblk" is mainly used to display information about block devices, including their associated mount points, but it does not provide the detailed views of filesystem types and mount options that "mount" does. The "df -h" command displays disk space usage information for each mounted filesystem, which is valuable for determining available space but does not give the detailed options and configuration for each mount. "parted" is primarily used for disk partition management and does not directly show which filesystems are mounted. Therefore, while useful in their contexts, they don’t fulfill the requirement of explicitly listing current mounted files