get this Entry's parent (the DirectoryEntry that owns this
Entry). All Entry objects, except the root Entry, has a parent.
this Entry's parent; null iff this is the root Entry
Delete this Entry. This operation should succeed, but there are
special circumstances when it will not:
If this Entry is the root of the Entry tree, it cannot be
deleted, as there is no way to create another one.
If this Entry is a directory, it cannot be deleted unless it is
true if the Entry was successfully deleted, else false
Rename this Entry. This operation will fail if:
There is a sibling Entry (i.e., an Entry whose parent is the
same as this Entry's parent) with the same name.
This Entry is the root of the Entry tree. Its name is dictated
by the Filesystem and many not be changed.